Chapter 19, Problem 10P

A container encloses 2 mol of an ideal gas that has molar mass M₁ and 0.5 mol of a second ideal gas that has molar mass M₂ = 3M₁. What fraction of the total pressure on the container wall is attributable to the second gas? (The kinetic theory explanation of pressure leads to the experimentally discovered law of partial pressures for a mixture of gases that do not react chemically: The total pressure exerted by the mature is equal to the sum of the pressures that the several gases would exert separately if each were to occupy the vessel alone. The molecule-vessel collisions of one type would not be altered by the presence of another type.)